天体参考系VLBI实现的精度评定
On accuracy assessment of celestial reference frame VLBI realizations
摘要：
本文提出用VLBI观测得到的天极差（CPO）序列的离散度作为天体参考系（CRF）实现精度的度量。几个散射指数（SI），包括首次提出的。第一个SI是基于CPO系列w.r.t.自由核心章动（FCN）模型。第二组SI包括Allan偏差及其扩展，它允许人们处理不等和多维观测。应用这些标准的几个无线电源目录显示他们的能力进行初步评估的质量的无线电源目录，和2D艾伦偏差估计似乎是一个最敏感的措施。然而，在一般情况下，测试标准的灵敏度还不足以区分最高质量的射电源目录。建议的扩展艾伦偏差，加权和多维，也可以有效地用于天文大地和其他时间序列的统计分析。
英文摘要：
In this paper, we propose to use the scatter of celestial pole offset (CPO) series obtained from VLBI observations as a measure of the accuracy of the celestial reference frame (CRF) realizations. Several scatter indices (SIs) including those proposed for the first time are investigated. The first SI is based on analysis of residuals of CPO series w.r.t. Free Core Nutation (FCN) model. The second group of SIs includes Allan deviation and its extensions, which allow one to treat unequal and multidimensional observations. Application of these criteria to several radio source catalogues showed their ability to perform a preliminary assessment of the quality of radio source catalogues, and 2D Allan deviation estimate seems to be a most sensitive measure. However, in common case, the sensitivity of tested criteria is yet not sufficient to distinguish between radio source catalogues of the highest quality. Proposed extensions of Allan deviation, weighted and multidimensional, can be effectively used also for statistical analysis of astro-geodetic and other time series.
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